Java by API/javax.mail/Transport

Transport: send(Message message)

 
import java.util.Properties;
import javax.mail.Address;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class Main {
  public static void main(String[] args) throws Exception {
    Properties props = new Properties();
    props.put("mail.host", "mail.cloud9.net");
    Session mailConnection = Session.getInstance(props, null);
    Message msg = new MimeMessage(mailConnection);
    Address a = new InternetAddress("a@a.ru", "A a");
    Address b = new InternetAddress("fake@jexp.ru");
    msg.setContent("Mail contect", "text/plain");
    msg.setFrom(a);
    msg.setRecipient(Message.RecipientType.TO, b);
    msg.setSubject("subject");
    Transport.send(msg);
  }
}